The shock in Stephan's Quintet is hypersonic in cold gas but weak in hot plasma, and its radio brightness boost is best explained by adiabatic compression of old cosmic-ray electrons rather than fresh particle acceleration.
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WEAVE First Light Observations: Origin and Dynamics of the Shock Front in Stephan's Quintet
The shock in Stephan's Quintet is hypersonic in cold gas but weak in hot plasma, and its radio brightness boost is best explained by adiabatic compression of old cosmic-ray electrons rather than fresh particle acceleration.